Let's say you made a game with several levels and every level is a ged file. Now, if you discover a bug (or you simply want change something) in a script used to behave a the player (or particular enemy) that is repeated on each level, it would be tedious to edit every script inside geds. If, instead, the script is included from a file on disk, changes on file will be reflected on each level.
Hope it make sense
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